JP6387816B2 - Rotating electric machine stator - Google Patents

Description

  The present invention relates to a stator for a rotating electrical machine including a stator core having a plurality of teeth, a stator coil wound around the teeth, and an insulator interposed between the stator core and the stator coil.

  As is well known, an insulator is disposed between the stator coil and the stator core of the rotating electrical machine for insulation. The insulator normally includes a rectangular tube-shaped portion that is inserted into the tooth, and a flange portion that protrudes outward from the periphery of the rectangular tube-shaped portion. In order to fix this insulator to the tooth, conventionally, a groove is formed on the side surface of the tooth, and a claw that fits into the groove is formed on the peripheral wall of the rectangular tube-shaped portion. The insulator was fixed to the teeth by fitting in the groove.

  Patent Document 1 discloses a technique for fixing a bobbin to a tooth by forming a convex portion on a side surface of a tooth and biting a bobbin (insulator) into the convex portion.

JP 2009-141992 A

  According to such a conventional technique, the insulator can be fixed to the tooth only by inserting the insulator into the tooth. However, in the case where the protruding portion (claw or the like) is provided on the insulator or the tooth as described above, a part of the insulator is rubbed against a part of the tooth in the process of inserting the insulator into the tooth. Since the insulator is usually made of a softer material than the teeth, a part of the insulator and a part of the insulator are rubbed against each other, so that a part of the insulator is scraped off and foreign matter may be generated.

  Therefore, an object of the present invention is to provide a stator for a rotating electrical machine that can appropriately fix an insulator while preventing generation of foreign matters.

  A stator of a rotating electrical machine according to the present invention includes a stator core having a plurality of teeth, a stator coil wound around the teeth, and an insulator interposed between the stator core and the stator coil. Each tooth is formed with one or more fixed recesses, and the insulator is formed in a rectangular tube portion inserted into the teeth and a peripheral wall of the rectangular tube portion, and the fixed recesses A fixed claw that fits into the teeth and is located outside the inner surface of the peripheral wall in a no-load state, and is movable in a direction to come in contact with and separate from the teeth, and the fixed claw is wound around the teeth. The stator coil that is rotated is pushed toward the fixed recess and is fitted into the fixed recess.

  In a preferred aspect, the fixed claw is a cantilever member whose base end is connected to the peripheral wall and swings around the base end. In this case, it is desirable that the fixed claw has a hook shape bent inward at the tip. It is also desirable that the fixed claw has a substantially triangular cross section that becomes thicker as it approaches the tip.

  A stator of a rotating electrical machine according to another aspect of the present invention includes a stator core having a plurality of teeth, a stator coil wound around the teeth, and an insulator interposed between the stator core and the stator coil. The stator of the electric machine, each tooth is formed with one or more fixed recesses, the insulator is formed on a rectangular tube portion inserted into the teeth, and a peripheral wall of the rectangular tube portion, A fixed claw that fits into the fixed recess, the base end of which is connected to the peripheral wall and the tip of the fixed claw is separated from the peripheral wall, and is movable in the direction of contacting and separating from the teeth. And the fixed claw is pushed toward the fixed concave portion by the stator coil wound around the teeth, and is fitted into the fixed concave portion.

  According to the present invention, even if the insulator is inserted into the teeth, the insulator and the teeth do not rub against each other strongly, so that the generation of foreign matters can be effectively prevented. Further, the stator coil is pushed by the stator coil toward the fixed recess and is fitted into the fixed recess, so that the insulator can be appropriately fixed.

It is a schematic longitudinal cross-sectional view of the stator of the rotary electric machine which is embodiment of this invention. It is a schematic cross-sectional view of a stator. It is a perspective view of an insulator. It is a cross-sectional view of an insulator. It is a cross-sectional view of an insulator. It is a cross-sectional view showing the manufacturing process of the stator. It is a cross-sectional view showing the manufacturing process of the stator. It is a perspective view of another insulator. It is a cross-sectional view of another insulator. It is a cross-sectional view of another insulator. It is a cross-sectional view of another insulator. It is a figure which shows an example of the teeth and insulator of the conventional stator.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic longitudinal sectional view of a rotating electrical machine 10 that is an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of the stator 20, and FIG. 3 is a perspective view of the insulator 26 attached to the teeth 32. In addition, in order to make the invention easy to understand, various dimensions in each drawing are different from actual ones, and some of the drawings do not coincide with each other. In the following description, “axial direction”, “radial direction”, and “circumferential direction” all mean the axial direction, radial direction, and circumferential direction of the stator 20.

  The rotating electrical machine 10 of this embodiment includes a rotor 12 and a stator 20. The rotor 12 includes a rotor core 14 and a plurality of permanent magnets 16 embedded in the rotor core 14. A rotary shaft 18 is inserted through the center of the rotor core 14, and the rotary shaft 18 is rotatably supported with respect to a case (not shown) via a bearing (not shown). The rotor 12 is rotatable with the rotary shaft 18.

  A stator 20 is disposed outside the rotor 12 so as to be concentric with the rotor 12. The stator 20 includes a substantially annular stator core 22 having a plurality of teeth 32 formed on the inner periphery thereof, a stator coil 24 wound around each tooth 32, and an insulator 26 interposed between the stator core 22 and the stator coil 24. It is equipped with. The stator core 22 is roughly divided into an annular yoke 30 and teeth 32 protruding to the inner peripheral side of the yoke 30. The stator core 22 is composed of a plurality of electromagnetic steel plates (for example, silicon steel plates) stacked in the axial direction. The teeth 32 have a substantially trapezoidal cross section that gradually becomes narrower as it approaches the inner peripheral side. Further, on both side surfaces of the teeth 32 in the circumferential direction, fixing recesses 36 for hooking the fixing claws 44 of the insulator 26 are formed. The fixed recess 36 is provided in the vicinity of the base end (near the boundary between the tooth 32 and the yoke 30) on the side surface of the tooth 32. In the illustrated example, 15 teeth 32 are provided, but this number may be changed as appropriate.

  The stator coil 24 is configured by concentrating windings of rectangular wires. The surface of the flat wire is enameled to ensure insulation between adjacent flat wires. The stator coil 24 has a three-phase coil, that is, a U-phase coil, a V-phase coil, and a W-phase coil. Each phase coil is configured by connecting a plurality of single coils in series. Is formed by winding a winding around one tooth 32. A plurality of teeth 32 are set so that a U-phase single coil, a V-phase single coil, and a W-phase single coil are repeatedly arranged in order in the circumferential direction. The configuration of the stator coil 24 is an example, and may be changed as appropriate. For example, the stator coil 24 is not limited to concentrated winding, and may be distributed winding, and the winding may be a round wire instead of a flat wire.

  An insulator 26 is disposed between the stator core 22 and the stator coil 24. The insulator 26 is a member made of an insulating material, for example, a resin material such as polyethylene terephthalate resin (PET resin). As shown in FIG. 3, the insulator 26 is roughly classified into a rectangular tube portion 40 having a substantially rectangular tube shape and a flange portion 42 that protrudes outward from the peripheral edge of the square tube portion 40. The rectangular tube-shaped portion 40 has a shape corresponding to the teeth 32, and is a rectangular tube shape with two radially opposed surfaces opened. The rectangular tubular portion 40 is inserted into the teeth 32 from the inner peripheral side and covers the periphery of the teeth 32. Of the peripheral walls constituting the rectangular tube-shaped portion 40, two fixed claws 44 are provided on each of two walls facing each other in the circumferential direction (hereinafter referred to as “side walls 40 s”). The fixed claw 44 is a cantilever member whose base end is connected to the side wall 40s and the front end is separated from the side wall 40s. This will be described in detail later.

  The collar portion 42 extends outward from the outer peripheral side end portion of the rectangular tube-shaped portion 40. The flange 42 is positioned along the inner peripheral surface of the yoke 30 when the insulator 26 is attached to the tooth 32, and is interposed between the yoke 30 and the stator coil 24.

  When manufacturing the stator 20, a single coil wound in advance is fitted around each insulator 26 (and thus around the teeth 32) in a state where the insulator 26 is attached to each tooth 32 of the stator core 22. . At this time, in order to fix the insulator 26 to the tooth 32, conventionally, a convex portion is formed in the insulator 26 and a concave portion is formed in the tooth 32, and both are engaged. However, in the conventional technique, the convex portion of the insulator 26 is a simple protrusion that hardly displaces or deforms, so that there is a possibility that foreign matter due to scraping may occur when the insulator 26 is mounted. This will be described with reference to FIG.

  FIG. 9 is a diagram showing how the conventional insulator 26 is mounted. In the conventional stator, the convex part 50 which protrudes toward inner side (tooth side) was provided in the inner surface of the side wall 40s of the insulator 26, and the recessed part 52 corresponding to the said convex part 50 was provided in the side surface of the teeth 32. When the insulator 26 is mounted, the insulator 26 is inserted into the teeth 32 from the inner peripheral side. At the time of insertion, since the convex portion 50 protrudes toward the side surface of the tooth 32, the side surface of the tooth 32 and the convex portion 50 rub against each other. When rubbing each other, the insulator 26 that is softer than the teeth 32 is scraped off, and foreign matter may be generated.

  In contrast to the example of FIG. 9, a technique is also proposed in which a convex portion is provided on the side surface of the tooth 32 and a concave portion is provided on the inner surface of the side wall 40 s of the insulator 26. Even in this case, in the process of inserting the insulator 26 into the tooth 32, the insulator 26 may rub against the convex portion of the tooth 32 and be scraped off.

  In the present embodiment, in order to avoid such a problem, the fixed claw 44 that engages with the fixed recess 36 is movable. This will be described with reference to FIGS. 4A and 4B. 4A and 4B are cross-sectional views of the insulator 26 around the fixed claw 44. FIG.

  As described above, the fixed claw 44 of the present embodiment is a cantilever member whose base end is connected to the side wall 40s and the front end is separated from the side wall 40s. The place where the fixing claw 44 is formed is thinner than other parts, and its strength is relatively weak. Therefore, the fixed claw 44 is like a leaf spring that can be easily swung with a relatively small force. Moreover, the front-end | tip of the fixed nail | claw 44 is bent in the hook shape toward the circumferential direction teeth side (circumferential inner side, the right direction in FIG. 4A). The length L of the flange portion 44a is larger than the thickness of the side wall 40s.

  As shown in FIG. 4A, the fixed claw 44 protrudes outward (slot side) from the inner surface of the side wall 40s in the no-load state. On the other hand, when the fixed claw 44 receives the force F in the circumferential teeth direction, the fixed claw 44 swings in the direction of the force F. Upon receiving this force F, when the outer surface of the fixed claw 44 swings to a position that substantially coincides with the outer surface of the side wall 40s, the tip (the hook-shaped portion 44a) of the fixed claw 44 is toothed from the inner surface of the side wall 40s. Protrudes to the side. And the part which protruded in the teeth side from the inner surface of this side wall 40s is comprised so that it may engage with the fixed recessed part 36 provided in the side surface of the teeth.

  Next, how the insulator 26 and the stator coil 24 are attached to the teeth 32 will be described with reference to FIGS. 5A and 5B. 5A and 5B are schematic cross-sectional views showing the manufacturing process of the stator 20. As shown in FIG. 5A, when the stator 20 is manufactured, the insulator 26 is inserted into the teeth 32 from the inner peripheral side. At this time, the fixed claw 44 is in an unloaded state where it does not receive the force on the circumferential teeth side. Therefore, the fixed claw 44 protrudes from the inner surface of the side wall 40s to the slot side. Therefore, even if the insulator 26 is inserted into the tooth 32, the fixed claw 44 does not hit the side surface of the tooth 32, and the fixed claw 44 and the side surface of the tooth 32 do not rub against each other. As a result, it is possible to effectively prevent the generation of foreign matters due to shaving.

  If the insulator 26 is inserted into the tooth 32, the stator coil 24 (single coil) is then wound in advance, and the stator coil 24 (single coil) is inserted around the insulator 26 (and thus around the teeth) from the inner peripheral side. At this time, the stator coil 24 advances to the outer peripheral side while hitting the side wall 40 s of the insulator 26 and the outer surface of the fixed claw 44. In this process, the fixing claw 44 receives a force in the circumferential teeth direction and swings toward the circumferential teeth side. Finally, as shown in FIG. 5B, the tip (the hook-shaped portion 44 a) protrudes from the inner surface of the side wall 40 s to the teeth side, and engages with the fixing recess 36 provided on the side surface of the tooth 32. The insulator 26 is fixed to the teeth 32 by this engagement.

  As is clear from the above description, in this embodiment, the fixed claw 44 is movable, and in the no-load state, the fixed claw 44 is positioned on the slot side from the inner surface of the side wall 40s. The side walls 40s do not rub against each other, and the generation of foreign matters can be effectively prevented. In addition, by performing a step essential for manufacturing the stator 20, which is the arrangement of the stator coil, the fixing claw 44 can be protruded from the inner surface of the side wall 40 s to the teeth side, and the insulator 26 can be fixed to the teeth 32. In other words, the insulator 26 can be fixed to the teeth 32 without adding a new process.

  The configuration described so far is merely an example, and the rectangular tube-shaped portion 40 is provided with a fixed claw 44 that is movable in the direction of contact with and away from the teeth 32, and the fixed claw 44 of the insulator 26 is not loaded. As long as it is located outside the inner surface of the peripheral wall, other configurations may be changed as appropriate. For example, in the present embodiment, one fixing claw 44 is provided at a substantially central position in the axial direction of one side wall 40s. However, the position and number of the fixed claws 44 may be changed as appropriate. Therefore, two or more fixed claws 44 may be provided on one side wall 40s, or the fixed claws 44 may be provided near the upper end or the lower end of the side wall 40s. Further, the fixing claw 44 may be provided only on one of the side walls 40s facing each other. Moreover, in this embodiment, although the fixed claw 44 is made into the thin plate shape extended in radial direction, the fixed claw 44 is good also as a shape extended in another direction, for example, an axial direction.

  In the present embodiment, the fixed recess 36 is provided near the base end of the tooth (near the boundary between the tooth 32 and the yoke 30), but the position of the fixed recess 36 may be closer to the inner periphery. In addition, when changing the position of the fixed recessed part 36, naturally the position of the fixed nail | claw 44 is also changed to the inner peripheral side. Moreover, if the fixed nail | claw 44 is provided in the surrounding wall of the insulator 26, it may be provided not only in the side wall 40s but in another wall surface. For example, as shown in FIG. 6, a fixing claw 44 may be provided on the axial end wall (top wall) of the insulator 26. In this case, the fixed recess 36 may be provided on the axial end surface of the tooth 32 (that is, the electromagnetic steel plate at the axial end or the end plate attached to the axial end). Even in such a configuration, if the stator coil 24 is inserted into the tooth 32 after the insulator 26 is attached to the tooth 32, the fixing claw 44 is pushed by the coil end portion of the stator coil 24, and the inside ( It is pushed into the teeth side) and engages with the fixed recess 36. As a result, the insulator 26 is appropriately fixed.

  In the present embodiment, the fixed claw 44 has a shape in which the tip is bent in a bowl shape, but may have other shapes. For example, considering the draft at the time of manufacture, as shown in FIG. 7, the fixed claw 44 may have a substantially triangular cross section that becomes thicker as it approaches the tip. In such a configuration, the insulator can be easily manufactured. In this case, it is desirable that the thickness of the tip of the fixed claw 44 is larger than the thickness of the side wall 40s.

  Further, in this embodiment, the fixed claw 44 is a cantilever member, but the fixed claw 44 is movable in a direction in which the fixed claw 44 comes into contact with and separates from the teeth and is positioned outside the inner surface of the peripheral wall in a no-load state. Other forms are possible. For example, as shown in FIG. 8A, both ends may be connected to the side wall 40s (or the axial end wall), and the center may be a belt-like member curved outwardly. When this fixed claw 44 receives an inward force (direction approaching the teeth), as shown in FIG. 8B, the fixed claw 44 (curved portion) is a curved portion that is convex on the opposite side, that is, on the inner side (tooth side). Transforms into The inwardly curved portion engages with the fixed recess 36.

  In the present embodiment, the fixed claw 44 is positioned closer to the slot than the inner surface of the peripheral wall in the no-load state. However, the fixed claw 44 may be positioned closer to the teeth than the inner surface of the peripheral wall in a no-load state as long as the fixed claws 44 are cantilevered so as to be swingable in the direction of contact with and away from the teeth. In this case, when the insulator 26 is inserted into the tooth 32, the fixing claw 44 hits the side surface of the tooth 32. However, if the fixed claw 44 is in the form of a cantilever, the fixed claw 44 swings away from the teeth 32 so as to avoid strong rubbing with the teeth 32, so that compared with the prior art shown in FIG. The load received by the fixed claw 44 is greatly reduced, and foreign matter generation due to the shaving of the fixed claw 44 is effectively prevented.

  DESCRIPTION OF SYMBOLS 10 Rotating electrical machine, 12 Rotor, 14 Rotor core, 16 Permanent magnet, 18 Rotating shaft, 20 Stator, 22 Stator core, 24 Stator coil, 26 Insulator, 30 Yoke, 32 teeth, 36 Fixed recessed part, 40 Square cylindrical part, 40s Side wall, 42 collar part, 44 fixing claw, 50 convex part, 52 concave part.

Claims (5)

A stator of a rotating electrical machine comprising a stator core having a plurality of teeth, a stator coil wound around the teeth, and an insulator interposed between the stator core and the stator coil,
Each tooth has one or more fixed recesses,
The insulator is
A rectangular tube-shaped portion inserted into the teeth;
A fixed claw that is formed on the peripheral wall of the rectangular tube-shaped portion and fits into the fixed recess, and is located outside the inner surface of the peripheral wall in a no-load state, and is movable in the direction of contacting and separating from the teeth. When,
The fixed claw is pushed to the fixed concave portion by the stator coil wound around the teeth, and is fitted into the fixed concave portion.
A stator for a rotating electrical machine. A stator for a rotating electrical machine according to claim 1,
The stator of the rotating electrical machine, wherein the fixed claw is a cantilever member whose base end is connected to the peripheral wall and swings around the base end. A stator for a rotating electrical machine according to claim 2,
The stator of a rotating electrical machine, wherein the fixed claw has a hook shape bent inward at a tip. A stator for a rotating electrical machine according to claim 2,
The stator of a rotating electrical machine, wherein the fixed claw has a substantially triangular cross section that becomes thicker as it approaches the tip. A stator of a rotating electrical machine comprising a stator core having a plurality of teeth, a stator coil wound around the teeth, and an insulator interposed between the stator core and the stator coil,
Each tooth has one or more fixed recesses,
The insulator is
A rectangular tube-shaped portion inserted into the teeth;
A fixing claw that is formed on the peripheral wall of the rectangular tube-shaped portion and fits into the fixing recess, the base end of which is connected to the peripheral wall, and the tip of the fixing claw is separated from the peripheral wall, and is in contact with the teeth. A fixed claw that is movable in the direction of separation,
The fixed claw is pushed to the fixed concave portion by the stator coil wound around the teeth, and is fitted into the fixed concave portion.
A stator for a rotating electrical machine.

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